CVE-2026-84409High· 7.5▾ Twilight

The device's update mechanism retrieves metadata for software updates over an unencrypted HTTP connection and stores portions of that metadata for later use

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score41/ 100 · Moderate

impact 41.3 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Sep 29, 2026

Updated

Sep 30, 2026

CVSS

7.5

Vendor

Lantronix

Product

G520 Series

CWE

CWE-79

Depth score

41 · Moderate

EPSS

0.42% · p36

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

decided 2026-09-30

Exploitation: none
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Sep 30.

0.4% → 0.4%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 27 days

Sep 29, 2026Published
Disclosed via NVD
Sep 30, 2026Record revised
Last analysed / modified upstream
Sep 30, 2026EPSS first tracked
0.4%
Oct 26, 2026EPSS peak
0.4% → 0.4%

Lantronix CWE-79 #nvd #cve.org

Affected

g520_series 2.6.0.4R6 stable

Full technical detail▾

Overview

The device's update mechanism retrieves metadata for software updates over an unencrypted HTTP connection and stores portions of that metadata for later use. A management interface subsequently returns this stored value in a JSON response, and the web interface responsible for displaying update information inserts that value directly into the page as HTML. This behavior allows attacker‑controlled metadata to be interpreted as script content. In addition, the same authenticated origin provides an interface capable of executing system‑level commands with root privileges. An attacker able to influence update metadata could exploit these conditions to execute arbitrary code within the administrative context of the device.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org

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